it has put a promotion on hold for the top u.s. commander in afghanistan. cbs reporter danielle nottingham on the story that is getting more complex by the day. >> reporter: the pentagon is investigating general john allen, the top u.s. commander in afghanistan, in connection with the scandal that took down cia director david petraeus. >> general allen is entitled to due process in this matter. >> reporter: the fbi gave the pentagon more than 20,000 pages of e-mail communications between general allen and sociality jill kelley. kelley went to the fbi with the anonymous threatening e-mails. agents traced those to paula broadwell and uncovered her affair with petraeus. one defense official described the e-mails between general allen and kelley as flirtatious. another official tells cbs news, some of the e-mails were more than sexy exchanges and may have crossed the line. general allen said he did nothing wrong but for now the capitol hill hearings on his promotion are delayed. >> at request of the secretary of defense, the president has put on hold the promot